Natural sources of vitamin D
In addition to being produced by the skin through sun exposure, vitamin D is found in certain foods. However, there are only a few foods that are natural sources of vitamin D: certain fatty fish (sardines, herring, salmon, trout, mackerel), and egg yolk.

Vitamin D in milk
In Canada, milk is required to be fortified with vitamin D and is the main source of this micronutrient in our diets. Vitamin D can also be found in some fortified beverages and yogurts.
The most recent national survey conducted by Statistics Canada shows that people who consume milk more than once a day show a higher blood level of vitamin D than those who do so less than once a day. This is an excellent reason to enjoy milk every day!
Canadian recommendations
According to Health Canada, the recommendations for vitamin D are 600 International Units (IU) for adults aged 19 to 70 years and 800 IU for people aged 71 and older.

Foods rich in vitamin D
Sources
Greene-Finestone et al. “Vitamin D status of Canadians as measured in the 2007 to 2009 Canadian Health Measures Survey.” statcan.gc.ca
https://www150.statcan.gc.ca/n1/pub/82-003-x/2010001/article/11131-eng.pdf
Government of Canada. “Dietary Reference Intakes.” canada.ca
https://www.canada.ca/en/health-canada/services/food-nutrition/healthy-eating/dietary-reference-intakes/tables/reference-values-vitamins-dietary-reference-intakes-tables-2005.html